I am aware that this was a challenging procedure for you, angie. I'll assist you so you can resume managing your 1099 by filling in QuickBooks Online Payroll.
Let's try to use an incognito window to see if you can proceed filling 1099 form within error encountered. Furthermore, we can try to clear the browser's cache from your regular browser.
Here are the shortcuts to incognito browsers:
Google Chrome: press Ctrl + Shift + N
Microsoft Edge: press Ctrl + Shift + N
Firefox: press Shift + CTRL + P
Furthermore, the cache can interfere with and affect the functionality of QuickBooks and result in missing tabs and features, thus, clearing the cache to lessen issues that arise when using QuickBooks.
However, if the issue persists, I encourage you to call our support team so they can help you investigate this issue and provide a possible fix.